NETA Spring 2025 Real-World Causes of Partial Discharge

The article Real-World Causes of Partial Discharge, published in NETA World, explores the practical aspects of partial discharge (PD), a phenomenon that can lead to catastrophic equipment failures in electrical systems. Authors William Higinbotham of EA Technology and Jay Prigmore of Google outline how improper construction techniques and seemingly minor issues, such as poorly positioned tie-wraps or insufficient air gaps, can trigger PD. The article provides real-world examples of switchgear and cable assembly errors, emphasizing the importance of correct insulation materials, proper conductor spacing, and environmental factors like humidity and contamination. By addressing these factors, engineers can improve equipment reliability and reduce the risks associated with PD.

Key Takeaways:

• Small air gaps in electrical systems can lead to PD, accelerating equipment degradation.
• Wrong materials in high-voltage environments, such as tie-wraps and electrical tape, can disrupt insulation integrity.
• Conductor and insulator geometry plays a crucial role in preventing localized electrical stress.
• Humidity and contaminants increase PD risk, making environmental control essential.
• Routine inspections and proper installation can significantly reduce PD-related failures.